JPS60132653A - Method for transferring ion exchange resin - Google Patents

Abstract

PURPOSE:To certainly transfer an anion exchange resin to the outside of a tower, by setting a transfer port to a lowermost part and transferring the residual anion exchange resin while collapsing the same by shower water supplied from above. CONSTITUTION:A transfer port 7 is provided to the side wall of an ion exchange tower 1 and the ion exchange resin above the transfer port 7 is transferred by flowing a fluid into the tower 1 only from above without flowing the fluid into said tower 1 from the lower part thereof. In the next step, the transfer port 7 is set to a lowermost part and the resin remaining so as to be inclined in an angle-of-repose state is transferred while collapsed by shower water supplied from above in the tower 1. By this method, only the resin above the transfer port is accurately transferred to the outside of the tower.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of accurately transferring the ion exchange resin present above the transfer port to the outside of the column from a transfer port opened in the side wall or inside the ion exchange column filled with ion exchange resin. It relates to a method of transferring

A typical example of an ion exchange device that involves the operation of transferring the ion exchange resin present above the transfer port to the outside of the column from a transfer port opened on the side wall or inside the column filled with ion exchange resin. A typical example is a condensate desalination device that performs separate bath regeneration.

That is, the used mixed ion exchange resin of cation exchange resin and anion exchange resin transferred from the water-flowing base is packed into a separation tower, and the cation exchange resin and anion exchange resin are backwashed and separated in the separation tower, and then the upper layer is separated. This is a condensate desalination equipment that transfers the anion exchange resin to a separate column and regenerates both ion exchange resins separately in the separate columns.

When transferring the ion exchange resin above the transfer port in the separation column of such a condensate desalination apparatus, that is, the anion exchange resin, to another column, the following method has conventionally been used.

That is, as shown in FIG. 1, the transfer pipe 6 is connected in advance to the column wall 5 at a location corresponding to the position of the separation interface 4 between the cation exchange resin 2 and the anion exchange resin 3 formed in the ion exchange column 1. In order to transfer the anion exchange resin 3 in the upper part of the transfer lower to the outside of the tower, water or compressed air is introduced from the upper inflow pipe 8 and water or compressed air is introduced from the lower inflow pipe 9. Transfer water flows in and the anion exchange resin 3 flows out of the column from the transfer lower in the form of slurry. However, in such a conventional transfer method, as shown in Fig. 2, the ion exchange resin at the lower part of the transfer lower part, that is, up to the cation exchange resin 2 flows out, and some anion exchange resin 3 remains. It has the following drawbacks. The reason for this is that the filled resin layer expands and flows slightly because the transfer water also flows in from the lower inflow pipe 9, and as a result, the ion exchange resin near the bottom of the transfer lower that expands and flows causes the water flowing toward the transfer lower (arrow line ) to flow out from the transport lower.

This is thought to be because the ion exchange resin located far above the transfer lower, that is, the anion exchange resin 3 remains, and this remaining anion exchange resin 3 is leveled out by the upward flow from the lower inflow pipe 9. Note that even if the transfer lower is opened slightly below the position of the separation boundary surface 4, the anion exchange resin 3
Similarly, a small amount of remains.

On the other hand, as shown in FIG. 3, the anion exchange resin 3 in the upper part of the transfer lower is slurried by inflowing water or compressed air only from the upper inflow pipe 8 without inflowing the transfer water from the lower inflow pipe 9. There is also a way to get it out of the tower.

Although this method has the advantage that the ion exchange resin below the transfer lower, that is, the cation exchange resin 2, does not flow out, as shown in Section 4, the ion exchange resin far above the transfer lower, that is, the anion exchange resin cannot be transferred. However, the anion exchange resin 3 remains at an angle of repose with the transfer lower being the lowest point.

Even if a transfer pipe 6 is passed through the shredded column wall 5 and a transfer lower is provided in the column, when transferring the ion exchange resin, if the fluid is introduced from the upper and lower parts of the column, the anions will be transferred as shown in FIG. It is the same that the exchange resin 3 remains and the ion exchange resin below the transfer lower flows out. Furthermore, if fluid is introduced only from the upper part of the tower, the transfer lower can be lowered to the lowest position as shown in Figure 6. Similarly, the anion exchange resin 3 remains in the shape of an angle of repose.

Note that a method has also been implemented in which a collector or outflow gutter having a number of transfer lowers is provided in the column at a location corresponding to the separation boundary surface 4, and the ion exchange resin above the collector is transferred to the outside of the column. When the ion exchange resin is backwashed and separated, the separation boundary surface 4 becomes unclear due to the influence of the collector or the outflow gutter, which is not preferable.

In this way, in the conventional transfer method, the ion exchange resin present below the transfer port cannot be discharged, and therefore, especially in condensate desalination equipment, the remaining anion exchange resin is used to regenerate the cation exchange resin. It has the disadvantage that chloride ions leak into the treated water when it comes into contact with an agent such as hydrochloric acid.

The present invention solves such drawbacks in conventional transfer methods and
The purpose of this system is to accurately transfer only the ion exchange resin present above the transfer lower to the outside of the column, and the transfer is carried out from the side wall of the ion exchange column filled with ion exchange resin or from the transfer port opened inside the column. When transferring the ion exchange resin present in the upper part of the mouth to the outside of the tower, the ion exchange resin is transferred to the tower by flowing fluid only from the upper part of the ion exchange tower without flowing the fluid from the lower part of the ion exchange tower. A transfer process is carried out to transfer the resin to the outside, and in the latter half of the transfer process, the remaining ion exchange resin is tilted with the transfer port at the lowest point, and the remaining ion exchange resin is removed using shower water and compressed air supplied from the upper part of the ion exchange tower. The present invention relates to a method for transferring an ion exchange resin, characterized in that the transfer is carried out with at least one step of showering in which the resin is transferred while being broken down, interposed in the transfer step.

The present invention will be explained in detail below, step by step, using a separation column of a condensate desalination apparatus as an example.

FIG. 7 is an explanatory diagram showing a flow of an example of an embodiment of the present invention, in which a distributor 10 having a large number of holes is installed in the upper part of the ion exchange column 1, and the distributor 1O and the upper inflow pipe 8 are communicated. At the same time, an air inlet pipe 11 is connected to the upper part of the ion exchange column 1. In addition, cation exchange resin 2 is formed by backwashing and separating and settling.
A transfer pipe 6 is communicated with the column wall 5 at a location corresponding to the separation boundary surface 4 of the anion exchange resin 3 and the anion exchange resin 3, and a transfer lower is opened in the column wall 5.

In the present invention, the mixed ion exchange resin transferred from the water tower (not shown) is backwashed and separated by a conventional method, and a valve (not shown) attached to the transfer pipe 6 is opened to open the upper inflow pipe 8. Transfer water flows in from. Note that no fluid such as transferred water or compressed air is allowed to flow in from the lower part of the ion exchange tower. Due to such a transfer process, the anion exchange resin 3 flows out from the transfer lower, but ultimately the transfer is completed as shown in Figure 8. The anion exchange resin 3 remains inclined at an angle of repose with the opening V at the lowest point. When such a state is reached, if there is a large amount of water in the column above the anion exchange resin 3, the water surface 12 will be slightly above the anion exchange resin 3 and the upper part will rise as shown in FIG. When water flows in from the transfer pipe 8.

Then, a shower step is performed in which compressed air is introduced from the air inlet pipe 11.

In this way, the disturbance flowing in from the upper transfer pipe 8 breaks down the remaining anion exchange resin 3 and flattens the resin surface, and at the same time directs the surface flow toward the transfer lower over the entire upper surface of the resin layer (see the dotted arrow line in Figure 9). ) can be formed.

As shown in FIG. 9, the remaining anion exchange resin 3 can be flowed out from the transfer lower by the surface flow in a manner that gradually sweeps up the resin particles on the surface layer, and eventually all of the anion exchange resin 3 is removed. leak.

Note that in the first step of the present invention, water is introduced from the upper transfer pipe 8 and compressed air is introduced from the air inflow pipe 11 because, for example, when only water is introduced, the water level 12 gradually rises, so that residual anions are This is because the effect of breaking up the exchange resin with shower water from the upper part of the tower and increasing its fluidity cannot be expected, and the fat will be exposed and the anion exchange resin 3 will not be able to flow out from the trenched transfer lower.

Therefore, in one step of the shower of the present invention, it is essential to introduce both water and compressed air, but the flow rate is, for example, LV 3 to 6 m /
h is appropriate.

Also, the pressure inside the column of compressed air is 0.8 kg/crh.
T and V3 to 6 m/h are appropriate, with the speed increasing around 0.

In the embodiment described above, the transfer lower is provided in the tower wall 5, but the transfer lower may be provided inside the tower as shown in FIG. 5 or 6.

Furthermore, when transferring the anion exchange resin 3, water may be introduced from the upper inflow pipe 8 and compressed air may be introduced from the air inflow pipe 11 from the beginning. This corresponds to one step of taking a shower.

As explained above, according to the present invention, conventionally the anion exchange resin 3 remaining at an angle of repose with the transfer lower at the lowest point can be transferred while being broken up by shower water supplied from the upper part of the ion exchange column. Therefore, it is possible to reliably transfer the anion exchange resin 3 to the outside of the column without leaving the anion exchange resin 3 in the upper part of the transfer lower.

The mixed ion exchange resin of Naori thione exchange resin and anion exchange resin is transferred to the ion exchange tower 1, backwashed and separated by a conventional method and settled, and then water is passed downward through the ion exchange resin to perform ion exchange. It is more desirable to transfer the anion exchange resin by performing a compression step for compressing the resin, and then performing the above-described transfer step or shower step.

That is, by such a compression process, the position of the separation boundary surface 4 can be brought into alignment with the position corresponding to the transfer lower with good reproducibility.

The embodiment of the present invention described above uses a separation tower of a condensate desalination apparatus as an example, and a transfer lower is established at the position of the separation boundary surface 4, and the anion exchange resin 3 in the upper part of the transfer lower is transferred to the outside of the column. However, the present invention is not limited to this, and for example, transfer lowers may be provided before and after the separation boundary surface 4.

It can also be applied when transferring the cation exchange resin and anion exchange resin between the transfer lowers to the outside of the column.

That is, as shown in FIG. 10, a transfer pipe 6 is connected to the tower wall 5 above the separation interface 4 between the cation exchange resin 2 and anion exchange resin 3 to open a transfer lower, and the lower part of the separation interface 4 between the cation exchange resin 2 and the anion exchange resin 3 is opened. A transfer pipe 6' is also connected to the tower wall 5 of the section to open a transfer lower ', and first, the anion exchange resin 3 above the transfer lower is transferred from the transfer pipe 6, for example, by the transfer process and shower step of the present invention described above. Transfer to an anion regeneration tower (not shown).

Next, as shown in FIG. 11, the anion exchange resin 3 and cation exchange resin 2 above the transfer rod are transferred to, for example, a retention tank (not shown) through the transfer pipe 6' by the transfer step and shower step of the present invention. Transport.

In this way, the anion exchange resin 3 and cation exchange resin 2 before and after including the separation interface 4 are transferred to the retention tank, and the anion exchange resin 3 transferred to the anion regeneration tower and the cation exchange resin 2 remaining in the ion exchange tower 1 are separated. Play only and mix.

By passing water through the water, highly purified treated water can be obtained more reliably.

Further, the transfer method of the present invention can be applied not only to the separation column of a condensate desalination apparatus but also to the case where the ion exchange resin present above the transfer port is reliably transferred to the outside of the column.

Examples will be described below to clarify the effects of the present invention.

Example inner diameter 2,000 mm, straight section height 6,000 m
6.2801 strong acid cation exchange resin Amberlite (registered trademark) 2000 and 3.14 m ion exchange column
01 strongly basic anion exchange resin Amberly) IR
, A, "900 mixed resin was filled.

In addition, the ion exchange column is preliminarily connected to the separation boundary surface.
An upper transfer port is opened by communicating the upper transfer pipe so that the lower end surface of the transfer pipe with an inner diameter of 67 mm is located on the tower wall at a position corresponding to 00 mm above the separation boundary surface, and an upper transfer port is opened at a position corresponding to 100 mm below the separation boundary surface. A lower transfer port was opened by communicating the lower transfer tube so that the upper end surface of the transfer tube having an inner diameter of 6'7 mm was located on the wall.

In such an ion exchange tower, backwash separation and
After settling, transfer was performed using the following transfer method of the present invention and a conventional transfer method.

(1) Conventional method L V 2, 5 m/l from the bottom of the ion exchange tower
At the same time, 1.3 kg/c of transfer water flows in from the top of the tower.
The anion exchange resin was taken out from the upper transfer port by flowing rRo compressed air at L V 5 m/h.

Next, in the same way, from the bottom of the ion exchange tower, Lv2-5m
/h of transfer water flows in, and at the same time 1.3 kg/h of water flows from the top of the tower.
Compressed air from aMG was flowed in at TJV 5 m/h, and the anion exchange resin and cation exchange resin including the separation interface were taken out from the lower transfer port.

(2) Method of the present invention-1 Compressed air of 1-5 kg/crF+G is introduced from the top of the ion exchange column at LV5 m/h and water is drained to the anion exchange resin surface. At the same time, compressed air of 1.3 kg/crAG was flowed in from the air inflow pipe installed at the top of the tower at T, V 5 m/h, and the tower was tilted at an angle of repose with the transfer port at the lowest point. The anion exchange resin is taken out from the upper transfer port through a shower step in which the residual anion exchange resin is broken up and transferred. 5 Then, in the same way, water is introduced into the distributor LV 5 m/h provided at the top of the tower, and water is poured into the upper part of the tower. 1.3 from the installed air inflow pipe
Compressed air of kg/crRG was flowed in at a LV of 5 m/h, and the anion exchange resin and cation exchange resin including the separation interface were taken out from the lower transfer port while being broken down in the same way.

(3) Method of the present invention-2 After performing backwash separation and settling, a compression step is performed in which water of LV10 m/b is introduced into the settled resin layer from the upper part of the ion exchange tower and the effluent water is discharged from the lower part of the tower. The transfer was carried out for 5 minutes, and thereafter, the transfer was carried out in exactly the same manner as Method-1 of the present invention.

Transfer was carried out using the conventional method and the method of the present invention as described above, and the conditions inside the ion exchange tower after transfer were observed, and the following results were obtained.

In the conventional method, although the ion exchange resin was transferred to 80 mm below the lower end of the lower transfer port, 20 mm of the anion exchange resin remained on the cation exchange resin in terms of resin layer height.

The amount of residual anion exchange resin was 631.

This corresponds to the second part of the anion exchange resin before transfer.

On the other hand, in method 1 of the present invention, the ion exchange resin is transferred up to 45 mm above the lower end of the lower transfer port.

Only a trace amount of anion exchange resin remained on the cation exchange resin.

In addition, in method-2 of the present invention, 45
The ion exchange resin was transferred up to 1.0 mm above the cation exchange resin, and no anion exchange resin was observed on the cation exchange resin.

In Method 1 of the present invention, when transferring the anion exchange resin present above the upper transfer port, the conventional method of flowing transfer water from the lower part of the ion exchange tower and compressed air from the upper part of the ion exchange tower is used. When the method of the present invention described above was carried out only when transferring the anion exchange resin and cation exchange resin including the separation interface from the lower transfer port, the state inside the ion exchange tower after transfer was as follows.
It was exactly the same as 1.

[Brief explanation of drawings]

Figures 1 to 6 all show the flow and transfer status in the conventional transfer method; Figures 1 and 3 are explanatory diagrams of the flow, and Figures 2, 4, and 5 6 are cutaway sectional views showing the state of transfer. Moreover, FIGS. 9 to 11 all show embodiments of the present invention, and FIGS. 7 and 8. FIG. 10 and FIG. 11 are explanatory diagrams of the flow. FIG. 9 is a cutaway sectional view showing the state of transfer. l...Ion exchange tower 2...Cation exchange resin 3.
...Anion exchange resin 4...Separation interface 5...Tower wall 6...Transfer pipe 7...Transfer port 8...Upper inflow pipe 9...Lower inflow pipe 1O...Distributor 1
1... Air inflow pipe 12... Water surface Fig. 1 Fig. 5 Fig. 6 $7 Fig. 8 Fig. 9 Fig. 10 Fig. 2 3 4

Claims (2)

[Claims] (1) From the transfer port established on the side wall or inside the ion exchange tower filled with ion exchange resin. When transferring the ion exchange resin present in the upper part of the transfer port to the outside of the column, ``no fluid flows in from the lower part of the ion exchange column. A transfer process is carried out in which fluid is introduced only from the upper part of the ion exchange column to transfer the ion exchange resin to the outside of the column, and in the latter half of the transfer process, the remaining ion exchange is carried out at an angle with the transfer port at the lowest point. A method for transferring an ion exchange resin, characterized in that at least one step of showering, in which the resin is broken down and transferred using shower water and compressed air supplied from the upper part of an ion exchange column, is interposed in the transfer step. (2) A method for transferring an ion exchange resin according to claim 1, wherein, before performing the transfer step, a compression step is performed in which the ion exchange resin is compressed by passing water downward through the ion exchange resin.